<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseenter="enter" @mouseleave="leave">
        <h2 class="all">全部商品分类</h2>
        <div class="sort" v-show="this.isShow" @mouseleave="showIndex = -1">
          <div class="all-sort-list2">
            <div
              class="item"
              v-for="(cate, index) in categoryList"
              :key="cate.categoryId"
              :class="showIndex === index ? 'active' : ''"
              @mouseenter="museEnter(index)"
              @click="goSearch"
            >
              <h3>
                <a
                  :data-categoryname="cate.categoryName"
                  :data-category1id="cate.categoryId"
                  >{{ cate.categoryName }}</a
                >
              </h3>
              <div class="item-list clearfix">
                <div class="subitem">
                  <dl
                    class="fore"
                    v-for="child in cate.categoryChild"
                    :key="child.categoryId"
                  >
                    <dt>
                      <a
                        :data-categoryname="child.categoryName"
                        :data-category2id="child.categoryId"
                        >{{ child.categoryName }}</a
                      >
                    </dt>
                    <dd>
                      <em
                        v-for="item in child.categoryChild"
                        :key="item.categoryId"
                      >
                        <a
                          :data-categoryname="item.categoryName"
                          :data-category3id="item.categoryId"
                          >{{ item.categoryName }}</a
                        >
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>

      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
import { mapState } from "vuex";
import _ from "lodash";
export default {
  name: "NavType",
  data() {
    return {
      showIndex: -1,
      isShow: this.$route.meta.isNav,
    };
  },
  mounted() {
    // 节流函数 trailing控制最后一次不执行
    this.museEnter = _.throttle(this.changeIndex, 50, { trailing: false });
  },
  methods: {
    // 移入事件
    changeIndex(index) {
      this.showIndex = index;
    },
    // 点击跳转路由事件
    goSearch(e) {
      // 通过e.target来判断当前点击的标签是否是A标签
      if (e.target.nodeName === "A") {
        // 创建一个容器放query传参的数据
        const query = {};
        const params = this.$route.params;
        const { category1id, category2id, category3id, categoryname } =
          e.target.dataset;
        query.categoryname = categoryname;
        if (category1id) {
          query.category1id = category1id;
        }
        if (category2id) {
          query.category2id = category2id;
        }
        if (category3id) {
          query.category3id = category3id;
        }
        this.$router.push({
          path: "/search",
          // query传参
          query,
          params,
        });
      }
    },
    enter() {
      this.isShow = true;
    },
    leave() {
      this.isShow = this.$route.meta.isNav;
    },
  },
  computed: {
    ...mapState("home", ["categoryList"]),
  },
  watch: {
    $route: {
      handler() {
        this.isShow = this.$route.meta.isNav;
      },
    },
  },
};
</script>
<style lang="less" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }
          &.active {
            background-color: #497;
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}
</style>